DUMPING OUT ALL THE NAME/VALUE PAIRS
The Dump() method produces a string consisting of all the
query's name/value pairs formatted nicely as a nested
list. This is useful for debugging purposes:
print $query->Dump
Produces something that looks like:

name1

value1

value2

name2

value1

As a shortcut, you can interpolate the entire CGI object
into a string and it will be replaced with the a nice HTML
dump shown above:
$query=new CGI;
print "